On Tue, Aug 25, 2015 at 05:06:12PM +0100, Behdad Esfahbod wrote: > Basically what's happening is this: > > - Lookup 0 joins gid9 to gid6 saying that gid9 should stay on the baseline, > > then: > > - Lookup 1 joins gid6 to git8 saying that gid8 should stay on the baseline. > > Essentially gid6 is attached to two different sides... I call this a faulty > font,
It is a hack (but necessary one) that I didn’t even expect to work, but it worked in Uniscribe. > but I'll work something out to match Uniscribe to the extent possible. > I suppose the later connection shall win, ie. gid8 stays on baseline and > everything else adjusted to follow. Yes, that is what Uniscribe is doing and my “expected” result. Regards, Khaled > b > > On 15-08-23 04:58 PM, Khaled Hosny wrote: > > I’ve a problem with mixing cursive attachment lookups with RTL flag set > > on some of them and not the others. > > > > I’m attaching two minimal fonts showing this issue, the only different > > between the good and bad fonts is that the bad font has a cursive > > attachment lookup with RTL flag not set while all the others have it > > set, and HarfBuzz seems to not to apply that lookup on the same word > > where the other lookups are applied. > > > > Testing with the word كمثل, the anchor between the 2nd and 3rd glyphs > > (from right) is not applied in the bad font but applied in the good one. > > Both DirectWrite/Uniscribe and Core Text apply it fine in both fonts > > (though Core Text has other serious problems). > > > > If I unset the RTL bit on all the cursive attachment lookups, it renders > > correctly in HarfBuzz. > > > > (If you are wondering why I’m doing this, it is because for some of my > > cursive attachments I want rightmost glyph to stay in its natural > > position and the other glyphs attached to it instead of having the > > leftmost glyph stay in its natural position.) > > > > Regards, > > Khaled > > > > > > > > _______________________________________________ > > HarfBuzz mailing list > > [email protected] > > http://lists.freedesktop.org/mailman/listinfo/harfbuzz > > _______________________________________________ HarfBuzz mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/harfbuzz
